CVE-2026-45797

6.4 mediumEPSS 0.6%

Medium (6.4). EPSS 0.6% chance of exploitation in the next 30 days.

HeyForm is an open-source form builder. Prior to version 3.0.0-rc.7, the `/api/upload` endpoint allows unauthenticated file uploads including SVG files. Uploaded SVGs are stored in the static assets directory and served with `Content-Type: image/svg+xml` by Express's serve-static middleware, allowing an attacker to achieve stored cross-site scripting (XSS) on the heyform domain without any authentication. Version 3.0.0-rc.7 contains a patch for the issue.

Severity

CVSS 4.0

6.4 medium

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N

EPSS: 0.6% chance of exploitation in the next 30 days; higher than 47% of CVEs (scores of 2026-10-31)
CWEs: CWE-79, CWE-434
Published: 2026-07-20
Modified: 2026-07-22
Record from: the NVD, synced 2026-10-19

References

https://github.com/heyform/heyform/commit/144240e5545d10fd9e120d05ccb402a6d7064674
https://github.com/heyform/heyform/security/advisories/GHSA-m94h-jxvc-hhch

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